期刊
JOURNAL OF ORGANOMETALLIC CHEMISTRY
卷 700, 期 -, 页码 117-124出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2011.11.024
关键词
Na2Pd2Cl6 complex; Ethyl calix[4]aryl acetate; Suzuki-Miyaura cross-coupling reaction; Ligand-free; Room temperature; Aqueous medium
资金
- National Natural Science Foundation of China [20772114]
- Innovation Fund for Outstanding Scholar of Henan Province [0621001100]
The new Na2Pd2Cl6 complex with ethyl calix[4] aryl acetate 2 was prepared simply and efficiently by the extraction of sodium ion from Na2PdCl4 aqueous solution with ethyl calix[4] aryl acetate. The structure of complex 2 could be verified by X-ray single crystal structure determination. The complex 2 was tested as catalyst in Suzuki-Miyaura cross-coupling reaction at room temperature in CH3OH/H2O medium under ambient conditions. Using 0.2 mol% of the complex 2 in the presence of K2CO3 as base offered excellent yields in the reaction of activated and non-activated aryl bromides with aryl boronic acids within 10 min. The key for achieving a very rapid and almost quantitative coupling is probably the use of ethyl calix[4] aryl acetate possessing extended hydrophobic host cavities and surface active properties. In addition, it was found that both solvent and base had a fundamental influence on the reaction. (C) 2011 Elsevier B. V. All rights reserved.
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